Sub-arcsecond 10 micron imaging of newly-formed stars

Details Sub-arcsecond 10 micron imaging of newly-formed stars Sub-arcsecond 10 micron imaging of newly-formed stars

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....3..153d&link_type=abstract

Experimental Astronomy, vol. 3, no. 1-4, p. 153-154

Astronomy and Astrophysics

Astronomy

Cosmic Dust, Infrared Astronomy, Infrared Telescopes, Pre-Main Sequence Stars, Star Formation, Stellar Envelopes, Stellar Evolution, Stellar Luminosity, Stellar Winds, Cameras, High Resolution, Infrared Astronomy Satellite, Spatial Resolution

Scientific paper

We describe initial results of a program to image massive newly-formed stars with sub-arc second spatial resolution. We discuss high-precision diffraction-limited size measurements at lambda = 10 micrometers made using the 3 m Lick telescope. The point-spread function has full width at half maximum (FWHM) of approximately 0.7 sec; deconvolution yields a spatial resolution of approximately 0.35 sec. We find that the core component of one such object, LkH-alpha 101, is unresolved at these scales, and we are able to set a 95%-confidence upper limit of approximately 270 AU for the diameter of the circumstellar dust shell. This places the dust at the same radial scale as a strong ionized stellar wind region seen at radio wavelengths. Our observations, when combined with published spectral observations, rule out an optically thick circumstellar disk but allow a radially thin, anisotropic distribution of dust, or alternatively an isotropic distribution of dust with a narrow arrange of large grain sizes.

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